Preparation method of food additive grade tricalcium phosphate

A food additive, tricalcium phosphate technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve problems such as poor coagulation and sedimentation effect, discharge of salty wastewater, impurity trapping and adsorption, etc., and it is easy to achieve process conditions. The effect of control, low impurity content and wide source of raw materials

Inactive Publication Date: 2010-02-24
GUANGDONG GUANGHUA SCI TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, domestic slaked lime is basically made by burning natural lime with coal. The slaked lime obtained in this way has relatively high impurity components, especially arsenic and heavy metals, which are easy to be brought into the final product. Therefore, it is produced by methods (2) and (3) When the tricalcium phosphate is used as a food additive, arsenic and other heavy metals often exceed the standard. Only by selecting high-quality hydrated lime and carrying out strict quality control can qualified products be obtained, which will inevitably increase costs; the main problems of method (4) A large amount of salty wastewater is discharged during the production process, and because the tricalcium phosphate formed is light and fine particles, the coagulation and sedimentation effect is poor, and the removal of impurities by washing is not thorough, and impurities are prone to entrapment and adsorption, which affects production efficiency and product quality

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Dissolve 300g of calcium chloride dihydrate with 500ml of pure water, add a spoonful of activated carbon, stir well, keep warm at 50-60°C for 20 minutes, then filter and clear it in a 2-liter beaker; add 168g of sodium hydroxide with a content of 96% Dissolve with 350ml of pure water, filter and clear for later use; add 80ml of food-grade phosphoric acid with a concentration of 85% by weight and add 170ml of pure water to dilute it into 38% phosphoric acid for later use;

[0021] (2) Under stirring, the above-mentioned sodium hydroxide solution is quickly added to the calcium chloride solution through a separatory funnel for reaction. Keep stirring at ℃ for 15 minutes, let it settle for 30 minutes, siphon out the supernatant and filter it;

[0022] (3) Add pure water to the filter cake obtained in step (2) to a total volume of 1.5 liters, stir at 60-65°C for 15 minutes after stirring, take out the supernatant after standing for 30 minutes, and then suction filter; ...

Embodiment 2

[0026] (1) Dissolve 300g of calcium chloride dihydrate with 500ml of pure water, add a spoonful of activated carbon, stir well, keep warm at 50-60°C for 20 minutes, then filter and clear it in a 2-liter beaker; add 172g of sodium hydroxide with a content of 96% Dissolve with 350ml of pure water, filter and clear for later use; add 80ml of food-grade phosphoric acid with a concentration of 85% by weight and add 170ml of pure water to dilute it into 38% phosphoric acid for later use;

[0027] (2) Under stirring, the above-mentioned sodium hydroxide solution is quickly added to the calcium chloride solution through a separatory funnel for reaction. Keep stirring at ℃ for 30 minutes, let it settle for 40 minutes, siphon out the supernatant and filter it;

[0028] (3) Add pure water to the filter cake obtained in step (2) to a total volume of 1.5 liters, stir it and insulate and stir at 55-60° C. for 20 minutes, let it settle for 35 minutes, take out the supernatant and then suctio...

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PUM

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Abstract

The invention provides a preparation method of food additive grade tricalcium phosphate, which comprising the following steps: using an aqueous calcium chloride solution and an aqueous sodium hydroxide solution to prepares fresh lime cream, aging, subsiding, filtering and washing the fresh lime cream to obtain calcium hydroxide precipitates; aging, centrifugalizing, drying and smashing tricalciumphosphate generated during reaction of the calcium hydroxide precipitates and phosphoric acid to obtain the product. The preparation method of the food additive grade tricalcium phosphate is easy to eliminate impurities through washing in such a way that the coacervation and sedimentation effect of calcium hydroxide particles is better than that of the phosphoric acid under the condition of high alkalinity and the calcium hydroxide particles wrap and absorb few impurities. The tricalcium phosphate product prepared by the method accords with China HG 2789-1996 and America FCC food additive standards in quality. The preparation method has extensive material source and easy technology condition control and is especially suitable for large-scaled industrialized production.

Description

technical field [0001] The invention relates to a preparation method of tricalcium phosphate, in particular to a preparation method of tricalcium phosphate used as a food additive. Background technique [0002] Tricalcium phosphate is a white amorphous powder, very slightly soluble in water, insoluble in ethanol, easily soluble in dilute hydrochloric acid and nitric acid. Tricalcium phosphate has a wide range of uses. It is used as anticaking agent, buffering agent, moisture retaining agent, acidity regulator, stabilizer and nutritional enhancer in the food industry; it is used as antacid and dental bonding in medicine. Agent; used as a dispersant in the plastic and rubber industries, and can also be used in the manufacture of ceramics, opal glass, syrup clarifying agent, poultry feed additive, etc. [0003] The usual preparation methods of tricalcium phosphate mainly include: (1) mixed firing method of phosphate rock and superphosphate; (2) reaction method of slaked lime a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/32
Inventor 陈旭波蒙跃笙张志斌王志勇
Owner GUANGDONG GUANGHUA SCI TECH
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